NodeXL Basic startup - MS Office Customization Installer

Nov 23, 2015 at 6:21 PM
When I launch a new NodeXL/Excel session on my Windows 7, the software is attempting to install a "customization" by connecting to http://www.nodexlgraphgallery.org/NodeXLBasicSetup/Smrf.NodeXL.ExcelTemplate.vsto

Why does it do this (every time)?
What is a .vsto file in general and what is this one in particular?
Is not installing the software (NodeXL Basic) sufficient, why must the software do this "customization" each time you launch?
Is there anyway to turn this attempt to connect off?

Thank you,
John B